Converts uppercase and lowercase letters to uppercase and lowercase letters.

Converts uppercase and lowercase letters to uppercase and lowercase letters.

// Kailu garji-blog Park Co., http://www.cnblogs.com/kailugaji/.

Method 1:

1 # include <stdio. h> 
2 # include <stdlib. h> 
3 // 32-bit 
4 void main () {
5 char ch, t; 
6 printf ("Please input a letter: \ n "); 
7 ch = getchar (); 
8 t = getchar (); // absorb the Enter key 
9 
10 while (ch <'A' & ch> 'Z ') | (ch <'Z' & ch> 'A') {
11 printf ("Input error! \ NPlease input again: \ n "); 
12 ch = getchar (); 
13} 
14 
15 if (ch & 32) 
16 ch = ch & 223; // change the fifth digit to 0 and the fifth digit to 
17 else ch = ch | 32; // reduce the fifth digit to 1 and write 
18 
19 putchar (ch ); 
20 printf ("\ n"); 
21}

Method 2:

1 # include <stdio. h> 
2 # include <stdlib. h> 
3 // 32-bit 
4 void main () {
5 char ch; 
6 printf ("Please input a letter: \ n "); 
7 scanf ("% c", & ch); 
8 ch = (ch> = 'A' & ch <= 'Z ')? (Ch + 32) :( (ch> = 'A' & ch <= 'Z ')? (Ch-32): printf ("Input error! "); 
9 printf (" % c \ n ", ch); 
10}

Result: